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Business Segments - Schedule of Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 20,174 | $ 21,003 | $ 20,633 | $ 23,225 | $ 23,079 | $ 28,743 | $ 21,115 | $ 27,116 | $ 85,035 | $ 100,053 | $ 83,073
Operating income (loss) | 1,653 | $ 1,351 | $ 1,248 | $ 664 | (1,100) | $ 2,826 | $ 1,485 | $ 2,861 | 4,916 | 6,072 | 3,641
Capital expenditures |  |  |  |  |  |  |  |  | 714 | 1,495 | 1,256
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,690 | 1,854 | 2,493
Identifiable assets | 126,477 |  |  |  | 149,406 |  |  |  | 126,477 | 149,406 |
Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 583 | 994 | 418
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,125 | 1,053 | 1,373
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Identifiable assets | 22,755 |  |  |  | 45,322 |  |  |  | 22,755 | 45,322 |
Operating Segments | Semiconductor |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 66,455 | 80,163 | 67,237
Operating income (loss) |  |  |  |  |  |  |  |  | 8,744 | 11,848 | 9,538
Identifiable assets | 56,855 |  |  |  | 59,744 |  |  |  | 56,855 | 59,744 |
Operating Segments | Semiconductor | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 379 | 352 | 236
Depreciation and amortization |  |  |  |  |  |  |  |  | 828 | 715 | 876
Operating Segments | SiC/LED |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 13,682 | 13,761 | 10,248
Operating income (loss) |  |  |  |  |  |  |  |  | 3,641 | 3,672 | 2,617
Identifiable assets | 7,779 |  |  |  | 6,545 |  |  |  | 7,779 | 6,545 |
Operating Segments | SiC/LED | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 171 | 603 | 12
Depreciation and amortization |  |  |  |  |  |  |  |  | 136 | 136 | 73
Operating Segments | Automation |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 4,898 | 6,129 | 5,588
Operating income (loss) |  |  |  |  |  |  |  |  | (786) | (2,897) | (724)
Identifiable assets | 2,661 |  |  |  | 3,586 |  |  |  | 2,661 | 3,586 |
Operating Segments | Automation | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 22 | 25 | 148
Depreciation and amortization |  |  |  |  |  |  |  |  | 103 | 135 | 325
Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (6,683) | (6,551) | (7,790)
Identifiable assets | $ 36,427 |  |  |  | $ 34,209 |  |  |  | 36,427 | 34,209 |
Non-Segment | Continuing Operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 11 | 14 | 22
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 58 | $ 67 | $ 99

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